[Asterisk-Users] codecs order

[Erik Versaevel]

That should be controllable by a weight, for example 2 peers:

A --> G729, G711
B --> G711, G729

What's currently happening is that * starts transcoding between the two
(g729 for A and G711 for B), what i would like is to apply a weight to
peer A so that the codec of choise at both sides becomes the preffered
choise of A (G729) on both sides so there won't be any transcoding.
This would allow for some nice things as fax passtrough (A and B has to
use G711 then, but if the weigted A says G711, B would use G711 to).

Kind regards,

Erik

Brian West wrote:

> Here is an example:
>
> Call comes in via PSTN... ulaw is the native format of the channel.  
> On the sip side you have g729,ulaw as the codec order.  That call 
> will end up being ulaw because we send the native format as our first 
> choice above all because we don't want to transcode.
>
> /b
>
>
>
> On Aug 15, 2005, at 1:10 PM, Tony Hoyle wrote:
>
>> Pavel Jezek wrote:
>>
>>> Hi,
>>> asterisk will negotiate codecs for both parties independently   (use
>>> sip show peer <peer> and look for "codec order" entry), so,  if you
>>> have prefered codec g729 for your sip phone/peer, asterisk  will use
>>> them (regardles of codec setting for other party - if  codecs does
>>> not match, asterisk will try to transcode between)
>>> imho ;-)
>>>
>>
>> It does seem to be a weakness of asterisk.. it's creating load on 
>> the server when it doesn't need to.
>>
>> Really it should look at the capabilities of both ends and see if 
>> there's a common set, and only start transcoding if there's no  overlap.
>>
>> Tony
>>
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